The bottom and fence bracket are connected with a dovetail and use a single M4x20 countersink screw to secure the bottom to the bracket. No nut is needed since it will make its own threads. This will make a solid connection. Print the bottom bracket with the flat side down and the bracket on it's side. Supports are needed for the brackets dovetail.
The author remixed this model.
This is a remix to mount the ecowitt WH57/WH32/WH31 to a fence